Full-tab cylindrical lithium battery cell structure

Abstract

The invention discloses a full-tab cylindrical lithium battery cell structure, and relates to the technical field of batteries, the full-tab cylindrical lithium battery cell structure comprises a battery unit and a heat dissipation mechanism, the heat dissipation mechanism is arranged on the outer side of the battery unit, the heat dissipation mechanism comprises a heat dissipation cylinder made of a heat conduction material, a flow channel is formed in the heat dissipation cylinder, and the flow channel is communicated with the heat dissipation cylinder. A liquid inlet pipe and a liquid outlet pipe which are communicated with the flow channel are further arranged on the heat dissipation cylinder; the heat dissipation barrel comprises a first barrel body and a second barrel body, the inner wall of the first barrel body is tightly attached to the outer wall of the battery unit, the first barrel body sequentially comprises an upper ring part, a middle ring part and a lower ring part from top to bottom, the thickness of the middle ring part is smaller than that of the upper ring part and that of the lower ring part, and an annular embedding groove is formed in the outer side wall of the first barrel body. The heat dissipation mechanism can reasonably distribute the cooling liquid of the liquid cooling system so as to quickly dissipate heat of each battery in the battery pack, so that the temperature of each battery is kept in a safe temperature area.

Description

Technical Field

[0001] The invention relates to the technical field of batteries, and in particular to a full-ear cylindrical lithium battery cell structure. Background Art

[0002] The full-tab cylindrical lithium battery cell structure is a common battery structure, which is widely used in mobile communication equipment, power tools, electric vehicles and energy storage systems. It is a common type of lithium battery, consisting of a positive electrode, a negative electrode, a separator, an electrolyte and an electrolyte.

[0003] Temperature in lithium-ion batteries is a key factor affecting the electrochemical performance, life and safety of the battery. High temperature can cause battery capacity decay, shorten life, and even cause thermal runaway and safety problems. However, currently most heat is dissipated through heat dissipation holes. When the external ambient temperature is too high, the heat dissipation effect is poor. In a high temperature environment, the battery life will be affected. Summary of the invention

[0004] The object of the present invention is to provide a full-tab cylindrical lithium battery cell structure to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme: The present invention provides a full-ear cylindrical lithium battery cell structure, comprising a battery unit and a heat dissipation mechanism, wherein the heat dissipation mechanism is arranged on the outside of the battery unit, and the heat dissipation mechanism comprises a heat dissipation cylinder made of a heat conductive material, a flow channel is formed inside the heat dissipation cylinder, and a liquid inlet pipe and a liquid outlet pipe connected to the flow channel are also arranged on the heat dissipation cylinder; The heat dissipation cylinder comprises a first cylinder body and a second cylinder body, the inner wall of the first cylinder body is closely attached to the outer wall of the battery cell, and the first cylinder body comprises an upper ring part, a middle ring part and a lower ring part from top to bottom, the thickness of the middle ring part is smaller than the thickness of the upper ring part and the lower ring part, so that an annular embedding groove is formed on the outer wall of the first cylinder body, and the second cylinder body is rotatably adapted in the annular embedding groove through a sealing structure, wherein the inner hollow of the upper ring part forms a first annular liquid collecting cavity, the inner hollow of the lower ring part forms a second annular liquid collecting cavity, the liquid inlet pipe is connected to the second annular liquid collecting cavity, and the liquid outlet pipe is connected to the first annular liquid collecting cavity; The flow channel includes a main flow channel and an auxiliary flow channel uniformly arranged between the middle ring part and the second cylinder body along the circumferential direction, the main flow channel and the auxiliary flow channel are arranged at intervals, the main flow channel is composed of a first groove body opened on the outer wall of the middle ring part and a second groove body opened on the inner wall of the second cylinder body, the auxiliary flow channel is composed of a third groove body opened on the outer wall of the middle ring part and a fourth groove body opened on the inner wall of the second cylinder body, the top of the lower ring part is provided with a first through hole for connecting the main flow channel with the second annular liquid collecting chamber, and the bottom of the upper ring part is provided with a second through hole for connecting the main flow channel and the auxiliary flow channel with the first annular liquid collecting chamber; The heat dissipation mechanism also includes a rotation driving member for driving the second cylinder to rotate relative to the first cylinder.

[0006] Furthermore, the sealing structure includes a first ring edge arranged at the top edge of the lower ring portion, a second ring edge arranged at the bottom edge of the upper ring portion, a third ring edge arranged at the top edge of the first cylinder, and a fourth ring edge arranged at the bottom edge of the first cylinder, wherein annular sealing grooves are provided between the first ring edge and the third ring edge and between the second ring edge and the fourth ring edge, and sealing rings are embedded in the annular sealing grooves.

[0007] Furthermore, the sealing structure also includes a first annular adhesive film wrapped around the outside of the first and third annular edges, and a second annular adhesive film wrapped around the outside of the second and fourth annular edges, wherein the upper half of the first annular adhesive film is bonded to the first annular edge by adhesive, and the lower half of the first annular adhesive film is bonded to the third annular edge by adhesive; the upper half of the second annular adhesive film is bonded to the second annular edge by adhesive, and the lower half of the second annular adhesive film is bonded to the fourth annular edge by adhesive.

[0008] Furthermore, the cross section of the main flow channel is equal to the cross section of the auxiliary flow channel and both are circular, and the spacing between adjacent main flow channels and auxiliary flow channels is smaller than the diameter of the main flow channel.

[0009] Further, the rotary drive member is used to drive the second cylinder to rotate between a first angle and a second angle relative to the first cylinder; When the second cylinder is at a first angle, the second groove on the second cylinder corresponds to the first groove on the middle ring, and the fourth groove on the second cylinder corresponds to the third groove on the middle ring; When the second cylinder is at the second angle, a portion of the second groove on the second cylinder is communicated with the first groove on the middle ring portion, and another portion of the second groove on the second cylinder is communicated with the third groove on the middle ring portion.

[0010] Furthermore, the heat dissipation mechanism also includes a temperature monitoring component, and the temperature monitoring component is used to monitor the temperature of the battery unit in real time.

[0011] Furthermore, the rotary drive member includes a telescopic structure uniformly arranged on the top of the first cylinder along the circumferential direction, the telescopic structure includes a shell, a circular arc cavity coaxial with the first cylinder is formed in the shell, a piston is slidably adapted in the circular arc cavity, an arc rod is fixed to one end of the piston, and one end of the arc rod passes through the shell and is fixedly connected to the second cylinder through a connecting member; The telescopic structure further comprises a return spring, which causes the piston to be located at an end of the circular arc cavity away from the circular arc rod; The telescopic structure further comprises a temperature tube embedded in the first cylinder, the temperature tube is filled with a thermal expansion liquid, and the top end of the temperature tube is connected to an end of the arc cavity away from the arc rod.

[0012] Furthermore, the battery unit includes a packaging shell and a wound battery cell assembled in the packaging shell, and the wound battery cell includes a positive electrode, a negative electrode, a first separator and a second separator.

[0013] Compared with the prior art, one or more of the above technical solutions have the following beneficial effects: The heat dissipation mechanism of the present invention can reasonably distribute the coolant of the liquid cooling system to quickly dissipate the heat of each battery in the battery pack so that the temperature of each battery is maintained within a safe temperature range.

[0014] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the top view of the heat dissipation mechanism of the present invention; Figure 3 yes Figure 2 AA structural diagram; Figure 4 yes Figure 2 BB structural diagram; Figure 5 It is a schematic diagram of the split structure of the first cylinder and the second cylinder of the present invention; Figure 6 It is a schematic diagram of a cross-sectional three-dimensional structure of the heat dissipation mechanism of the present invention; Figure 7 yes Figure 3 Schematic diagram of the local structure at C; Figure 8 yes Figure 3 Schematic diagram of the local structure at D; Fig. 9 It is a front view structural schematic diagram of the heat dissipation mechanism of the present invention; Fig.10 yes Fig. 9 Schematic diagram of the FF structure; Fig.11 yes Fig.10 Schematic diagram of the local structure of the place; Fig.12 yes Fig. 9 Schematic diagram of EE structure; Fig.13 yes Fig.12 A schematic diagram of the second state structure; Fig.14 yes Fig.12 A schematic diagram of the third state structure of; Fig.15 It is a schematic diagram of the structure of the battery pack of the present invention.

[0017] In the figure: 1-battery unit; 2-heat dissipation cylinder; 21-first cylinder; 211-upper ring; 2111-first annular liquid collecting cavity; 2112-second through hole; 212-middle ring; 213-lower ring; 2131-second annular liquid collecting cavity; 2132-first through hole; 214-annular embedded groove; 22-second cylinder; 3-liquid inlet pipe; 4-liquid outlet pipe; 5-battery pack; 6-main channel; 61-first tank; 62-second Second trough body; 7-auxiliary flow channel; 71-third trough body; 72-fourth trough body; 8-rotating drive member; 81-telescopic structure; 811-housing; 812-arc cavity; 813-piston; 814-arc rod; 815-reset spring; 816-temperature tube; 91-first ring edge; 92-second ring edge; 93-third ring edge; 94-fourth ring edge; 95-sealing ring; 96-first annular rubber film; 97-second annular rubber film. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0019] See also Figure 1-Figure 15The present invention provides a full-ear cylindrical lithium battery cell structure, including a battery unit 1 and a heat dissipation mechanism, wherein the heat dissipation mechanism is arranged on the outside of the battery unit 1, and the heat dissipation mechanism includes a heat dissipation tube 2 made of a heat conductive material, a flow channel is formed inside the heat dissipation tube 2, and a liquid inlet pipe 3 and a liquid outlet pipe 4 connected to the flow channel are also arranged on the heat dissipation tube 2.

[0020] When in use, multiple battery cells 1 of the present invention can be loaded into a battery box, and a battery pack 5 with suitable voltage and current can be formed by connecting in parallel and in series. Fig.15 As shown), the liquid inlet pipe 3 and the liquid outlet pipe 4 of each heat dissipation mechanism are connected in series and then connected to the existing liquid cooling system; specifically, the liquid inlet pipes 3 and the liquid outlet pipes 4 of two adjacent heat dissipation mechanisms are connected through pipelines to form a series structure, and the two heat dissipation mechanisms are respectively connected to the liquid supply pipe and the return pipe of the liquid cooling system (among the two heat dissipation mechanisms, the liquid inlet pipe 3 of one heat dissipation mechanism is connected to the liquid supply pipe of the liquid cooling system, and the liquid outlet pipe 4 of the other heat dissipation mechanism is connected to the return pipe of the liquid cooling system); When the battery pack 5 is in operation, the liquid cooling system is started, and the coolant flows through the flow channel of each heat dissipation mechanism to help the battery pack 5 dissipate heat through heat transfer.

[0021] Since each battery unit 1 (hereinafter referred to as battery) is located at a different position and has a different working state, the temperature of each battery in the battery pack 5 will be different. For example, the battery at the center of the battery pack 5 is located at the center of the battery box, and its external temperature is not easy to dissipate, so its temperature will be higher. In order to extend the service life of the battery and avoid safety problems such as battery capacity attenuation, shortened life, and thermal runaway caused by high temperature.

[0022] Combination Figure 3-5 As shown, in this embodiment, the heat dissipation cylinder 2 includes a first cylinder 21 and a second cylinder 22, the inner wall of the first cylinder 21 is closely attached to the outer wall of the battery unit 1, and the first cylinder 21 includes an upper ring portion 211, a middle ring portion 212 and a lower ring portion 213 from top to bottom, the thickness of the middle ring portion 212 is less than the thickness of the upper ring portion 211 and the lower ring portion 213, so that an annular embedding groove 214 is formed on the outer wall of the first cylinder 21, and the second cylinder 22 is rotatably adapted in the annular embedding groove 214 through a sealing structure, wherein the upper ring portion 211 has a first annular liquid collecting cavity 2111 formed in the internal hollow of the upper ring portion 211, and the lower ring portion 213 has a second annular liquid collecting cavity 2131 formed in the internal hollow of the lower ring portion 213, the liquid inlet pipe 3 is connected to the second annular liquid collecting cavity 2131, and the liquid outlet pipe 4 is connected to the first annular liquid collecting cavity 2111; The flow channel includes a main flow channel 6 and an auxiliary flow channel 7 uniformly arranged between the middle ring portion 212 and the second cylinder 22 along the circumferential direction, the main flow channel 6 and the auxiliary flow channel 7 are arranged at intervals, the main flow channel 6 is composed of a first groove body 61 opened on the outer wall of the middle ring portion 212 and a second groove body 62 opened on the inner wall of the second cylinder 22, the auxiliary flow channel 7 is composed of a third groove body 71 opened on the outer wall of the middle ring portion 212 and a fourth groove body 72 opened on the inner wall of the second cylinder 22, the top of the lower ring portion 213 is provided with a first through hole 2132 for connecting the main flow channel 6 with the second annular liquid collecting chamber 2131, and the bottom of the upper ring portion 211 is provided with a second through hole 2112 for connecting the main flow channel 6 and the auxiliary flow channel 7 with the first annular liquid collecting chamber 2111; like Figure 1 As shown, the heat dissipation mechanism further includes a rotating driving member 8 for driving the second cylinder 22 to rotate relative to the first cylinder 21 .

[0023] Based on the above-mentioned design, the heat dissipation mechanism of the present invention can reasonably distribute the coolant of the liquid cooling system to quickly dissipate the heat of each battery in the battery pack 5 so that the temperature of each battery is maintained within a safe temperature range.

[0024] Specifically, Fig.12 As shown, in the initial stage of the battery pack 5, since the temperature of each battery in the battery pack 5 is relatively low, after the coolant enters the second annular liquid collecting chamber 2131 through the liquid inlet pipe 3, it enters the main flow channel 6 (i.e., the first slot body 61 and the second slot body 62 correspond) through the first through hole 2132 and flows into the first annular liquid collecting chamber 2111 along the main flow channel 6. At this time, the coolant only flows in the main flow channel 6, and the coolant stored in the auxiliary flow channel 7 does not participate in the circulation, that is, the flow path of the coolant in the battery pack 5 is only the main flow channel 6; As the working time of the battery pack 5 increases, when the temperature of a battery exceeds the safe temperature (the battery is located at the center of the battery pack 5 or a battery with poor performance), the corresponding second cylinder 22 can be driven to rotate by the rotating driving member 8 of the corresponding heat dissipation mechanism, so that the first slot 61 and the second slot 62 are misaligned, and the third slot 71 and the fourth slot 72 are misaligned (such as Fig.13 As shown), the contact area between the coolant and the heat dissipation tube 2 can be increased to enhance the heat dissipation efficiency of a certain battery; In the above process, for batteries with different temperatures, the contact area between the coolant and the heat dissipation tube 2 can be adaptively increased by rotating the angle of the second cylinder 22. For example, for batteries with higher temperatures, the contact area between the coolant and the heat dissipation tube 2 can be increased by increasing the rotation angle of the second cylinder 22, thereby improving the heat dissipation effect; while for batteries with lower temperatures, the rotation angle of the second cylinder 22 can be correspondingly reduced to reduce the contact area between the coolant and the heat dissipation tube 2, thereby preventing the temperature of the coolant flowing in the battery pack 5 from rising (the coolant flows through each heat dissipation mechanism in turn), resulting in a decrease in cooling efficiency when cooling batteries with higher temperatures; As the rotation angle of the second cylinder 22 increases, when the second groove 62 partially overlaps with the fourth groove 72, the main flow channel 6 is connected to the auxiliary flow channel 7. At this time, the coolant entering the heat dissipation cylinder 2 flows in a ring shape (such as Fig.14 As shown in the figure, the contact area between the coolant and the heat dissipation tube 2 is the largest, and in this process, due to the increase in the coolant flow path, the time for the coolant to pass through the heat dissipation tube 2 is also extended, so that the heat dissipation efficiency is maximized.

[0025] like Figure 7 and Figure 8 As shown, in this embodiment, the sealing structure includes a first ring edge 91 arranged at the top edge of the lower ring portion 213, a second ring edge 92 arranged at the bottom edge of the upper ring portion 211, a third ring edge 93 arranged at the top edge of the first cylinder 21, and a fourth ring edge 94 arranged at the bottom edge of the first cylinder 21, wherein an annular sealing groove is provided between the first ring edge 91 and the third ring edge 93, and between the second ring edge 92 and the fourth ring edge 94, and a sealing ring 95 is embedded in the annular sealing groove. Through the above design, the sealing ring 95 is used to achieve sealing between the first cylinder 21 and the annular embedded groove 214 to prevent leakage of the coolant.

[0026] like Figure 7 and Figure 8As shown, in this embodiment, the sealing structure further includes a first annular film 96 wrapped around the outside of the first annular edge 91 and the third annular edge 93, and a second annular film 97 wrapped around the outside of the second annular edge 92 and the fourth annular edge 94, wherein the upper half of the first annular film 96 is bonded to the first annular edge 91 by adhesive, and the lower half of the first annular film 96 is bonded to the third annular edge 93 by adhesive; the upper half of the second annular film 97 is bonded to the second annular edge 92 by adhesive, and the lower half of the second annular film 97 is bonded to the fourth annular edge 94 by adhesive. Based on the above design, the first annular film 96 and the second annular film 97 can further improve the sealing effect, and the first annular film 96 and the second annular film 97 can undergo elastic deformation, so that the second cylinder 22 can rotate at a certain angle relative to the first cylinder 21.

[0027] In this embodiment, the cross section of the main flow channel 6 is equal to the cross section of the auxiliary flow channel 7 and both are circular, and the distance between adjacent main flow channels 6 and auxiliary flow channels 7 is smaller than the diameter of the main flow channel 6 .

[0028] In this embodiment, the rotary driving member 8 is used to drive the second cylinder 22 to rotate relative to the first cylinder 21 between a first angle and a second angle; When the second cylinder 22 is at the first angle (such as Fig.12 As shown), the second groove body 62 on the second cylinder 22 corresponds to the first groove body 61 on the middle ring portion 212, and the fourth groove body 72 on the second cylinder 22 corresponds to the third groove body 71 on the middle ring portion 212; When the second cylinder 22 is at the second angle (such as Fig.14 As shown), a portion of the second groove body 62 on the second cylinder 22 is connected to the first groove body 61 on the middle ring portion 212, and another portion of the second groove body 62 on the second cylinder 22 is connected to the third groove body 71 on the middle ring portion 212.

[0029] Based on the above design, when the second cylinder 22 is at the first angle, the heat dissipation efficiency of the heat dissipation mechanism is the worst. When the second cylinder 22 rotates from the first angle toward the second angle, the heat dissipation efficiency of the heat dissipation mechanism slowly increases. When the second cylinder 22 is at the second angle, the heat dissipation efficiency of the heat dissipation mechanism is increased to the maximum.

[0030] In this embodiment, the heat dissipation mechanism further includes a temperature monitoring component, and the temperature monitoring component is used to monitor the temperature of the battery unit 1 in real time.

[0031] Combination Figure 1 and Fig.11As shown, in this embodiment, the rotary drive member 8 includes a telescopic structure 81 uniformly arranged on the top of the first cylinder 21 along the circumferential direction, and the telescopic structure 81 includes a shell 811, and a circular arc cavity 812 coaxial with the first cylinder 21 is formed in the shell 811, and a piston 813 is slidably adapted in the circular arc cavity 812, and an arc rod 814 is fixed to one end of the piston 813, and one end of the arc rod 814 passes through the shell 811 and is fixedly connected to the second cylinder 22 through a connecting member; The telescopic structure 81 further includes a return spring 815, and the return spring 815 enables the piston 813 to be located at an end of the arc cavity 812 away from the arc rod 814; The telescopic structure 81 further includes a temperature tube 816 embedded in the first cylinder 21 . The temperature tube 816 is filled with a thermal expansion liquid, such as mercury, and the top end of the temperature tube 816 is connected to an end of the arc cavity 812 away from the arc rod 814 .

[0032] Based on the above design, when the battery pack 5 is not working, the battery temperature is low. At this time, under the action of the return spring 815, the piston 813 is at the end of the arc cavity 812 away from the arc rod 814, and the second cylinder 22 is at the first angle. As the battery temperature continues to rise, the thermal expansion liquid will expand and enter the shell 811 and push the piston 813 to move in the arc cavity 812 toward the end of the arc rod 814. The second cylinder 22 is driven by the arc rod 814 and the connecting piece to rotate from the first angle to the second angle. When the piston 813 moves in the arc cavity 812 to the end close to the arc rod 814, the second cylinder 22 is at the second angle.

[0033] In this embodiment, the battery unit 1 includes a packaging shell and a wound battery cell assembled in the packaging shell, and the wound battery cell includes a positive electrode, a negative electrode, a first separator and a second separator.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A full-ear cylindrical lithium battery cell structure, characterized in that: It includes a battery unit and a heat dissipation mechanism, wherein the heat dissipation mechanism is arranged outside the battery unit, and the heat dissipation mechanism includes a heat dissipation tube made of a heat-conducting material, a flow channel is formed inside the heat dissipation tube, and a liquid inlet pipe and a liquid outlet pipe connected to the flow channel are also arranged on the heat dissipation tube; The heat dissipation cylinder comprises a first cylinder body and a second cylinder body, the inner wall of the first cylinder body is closely attached to the outer wall of the battery cell, and the first cylinder body comprises an upper ring part, a middle ring part and a lower ring part from top to bottom, the thickness of the middle ring part is smaller than the thickness of the upper ring part and the lower ring part, so that an annular embedding groove is formed on the outer wall of the first cylinder body, and the second cylinder body is rotatably adapted in the annular embedding groove through a sealing structure, wherein the inner hollow of the upper ring part forms a first annular liquid collecting cavity, the inner hollow of the lower ring part forms a second annular liquid collecting cavity, the liquid inlet pipe is connected to the second annular liquid collecting cavity, and the liquid outlet pipe is connected to the first annular liquid collecting cavity; The flow channel includes a main flow channel and an auxiliary flow channel uniformly arranged between the middle ring part and the second cylinder body along the circumferential direction, the main flow channel and the auxiliary flow channel are arranged at intervals, the main flow channel is composed of a first groove body opened on the outer wall of the middle ring part and a second groove body opened on the inner wall of the second cylinder body, the auxiliary flow channel is composed of a third groove body opened on the outer wall of the middle ring part and a fourth groove body opened on the inner wall of the second cylinder body, the top of the lower ring part is provided with a first through hole for connecting the main flow channel with the second annular liquid collecting chamber, and the bottom of the upper ring part is provided with a second through hole for connecting the main flow channel and the auxiliary flow channel with the first annular liquid collecting chamber; The heat dissipation mechanism also includes a rotation driving member for driving the second cylinder to rotate relative to the first cylinder.

2. The full-ear cylindrical lithium battery cell structure according to claim 1, characterized in that: The sealing structure includes a first ring edge arranged at the top edge of the lower ring portion, a second ring edge arranged at the bottom edge of the upper ring portion, a third ring edge arranged at the top edge of the first cylinder, and a fourth ring edge arranged at the bottom edge of the first cylinder, wherein an annular sealing groove is provided between the first ring edge and the third ring edge and between the second ring edge and the fourth ring edge, and a sealing ring is embedded in the annular sealing groove.

3. The full-ear cylindrical lithium battery cell structure according to claim 1, characterized in that: The sealing structure also includes a first annular film covering the outside of the first and third ring edges, and a second annular film covering the outside of the second and fourth ring edges, wherein the upper half of the first annular film is bonded to the first ring edge by adhesive, and the lower half of the first annular film is bonded to the third ring edge by adhesive; the upper half of the second annular film is bonded to the second ring edge by adhesive, and the lower half of the second annular film is bonded to the fourth ring edge by adhesive.

4. The full-ear cylindrical lithium battery cell structure according to claim 1, characterized in that: The cross section of the main flow channel is equal to the cross section of the auxiliary flow channel and both are circular, and the spacing between adjacent main flow channels and auxiliary flow channels is smaller than the diameter of the main flow channel.

5. The full-ear cylindrical lithium battery cell structure according to claim 4, characterized in that: The rotary drive member is used to drive the second cylinder to rotate relative to the first cylinder between a first angle and a second angle; When the second cylinder is at a first angle, the second groove on the second cylinder corresponds to the first groove on the middle ring, and the fourth groove on the second cylinder corresponds to the third groove on the middle ring; When the second cylinder is at the second angle, a portion of the second groove on the second cylinder is communicated with the first groove on the middle ring portion, and another portion of the second groove on the second cylinder is communicated with the third groove on the middle ring portion.

6. The full-ear cylindrical lithium battery cell structure according to claim 5, characterized in that: The heat dissipation mechanism also includes a temperature monitoring component, and the temperature monitoring component is used to monitor the temperature of the battery unit in real time.

7. The full-ear cylindrical lithium battery cell structure according to claim 5, characterized in that: The rotary drive member comprises a telescopic structure uniformly arranged on the top of the first cylinder along the circumferential direction, the telescopic structure comprises a shell, a circular arc cavity coaxial with the first cylinder is formed in the shell, a piston is slidably adapted in the circular arc cavity, an arc rod is fixed to one end of the piston, and one end of the arc rod passes through the shell and is fixedly connected to the second cylinder through a connecting member; The telescopic structure further comprises a return spring, which causes the piston to be located at an end of the arc cavity away from the arc rod; The telescopic structure further comprises a temperature tube embedded in the first cylinder, the temperature tube is filled with a thermal expansion liquid, and the top end of the temperature tube is connected to an end of the arc cavity away from the arc rod.

8. The full-ear cylindrical lithium battery cell structure according to claim 1, characterized in that: The battery unit comprises a packaging shell and a wound battery cell assembled in the packaging shell, wherein the wound battery cell comprises a positive electrode, a negative electrode, a first separator and a second separator.

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